Data/hora: 21/06/2024 18:21:41

Biblioteca(s): | Embrapa Arroz e Feijão.
Data corrente: | 17/03/1999
Data da última atualização: | 23/09/2021
Autoria: | BRESEGHELLO, F.; MORAIS, O. P. de; RANGEL, P. H. N.
Afiliação: | FLAVIO BRESEGHELLO, CNPAF; ORLANDO PEIXOTO DE MORAIS, CNPAF; PAULO HIDEO NAKANO RANGEL, CNPAF.
Título: | A new method to estimate genetic gain in annual crops.
Ano de publicação: | 1998
Fonte/Imprenta: | Genetics and Molecular Biology, v. 21, n. 4, p. 551-555, 1998.
DOI: | https://doi.org/10.1590/S1415-47571998000400024
Idioma: | Inglês
Conteúdo: | The genetic gain obtained by breeding programs to improve quantitative traits may be estimated by using data from regional trials. A new statistical method for this estimate is proposed and includes four steps: a) joint analysis of regional trial data using a generalized linear model to obtain adjusted genotype means and covariance matrix of these means for the whole studied period; b) calculation of the arithmetic mean of the adjusted genotype means, exclusively for the group of genotypes evaluated each year; c) direct year comparison of the arithmetic means calculated, and d) estimation of mean genetic gain by regression. Using the generalized least squares method, a weighted estimate of mean genetic gain during the period is calculated. This method permits a better cancellation of genotype x year and genotype x trial/year interactions, thus resulting in more precise estimates. This method can be applied to unbalanced data, allowing the estimation of genetic gain in series of multilocational trials.
Thesagro: | Genética; Melhoramento genético vegetal.
Categoria do assunto: | G Melhoramento Genético
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/122712/1/upc.pdf
Registro original: | Embrapa Arroz e Feijão (CNPAF)
Exemplares: | CNPAF - (14320-1) - UPC - AP - DD - 1998 -  - 1998 - DIS